Started to try and form Germany as Austria. 1895. Problems:
Prussia is doggedly not going down, after takin 2 of it's major industrual bases and humiliating it / asserting heg twice.
My South German Federation (haha, take 1 tiny prussian province and get 3 major ones!) decided to become a great power and revolt. I haven't tried the puppet mechanic, but I took Franken to stop then becoming a GP again.
Russia (that whore) joined France and Italy to liberate Venice. While I beat all 3 back, I took Mescowietz. Russia latter dropped off the GP list to 10th. I tried to influence them, but played diplo war with Japan (while also trying to keep Prussia out of my spherelings). I lost the diplo war and Russia declared liberation of Mescowietz. Enraged, I blew out the infamy limit and took Kiev (population density map showed it had a TON of pops), but to avoid a landlocked province, took Rovne. They refused to submit, so I battered them until they also allowed me to take Minsk.
I am still pursuing Germany, but sidetracked by russia. However, now that i'm over the infamy limit (55), have an Anti Military power in party for rank 9th Mil score (I wanted their LF/Free Trade), and surrounded by GP Prussia, France, GB, as well as Italy, Ottos and New Russia, I almost HAVE to form germany to survive. Even with the Jingos I'm only 3rd, so I will probably soon declare war on Prussia, shatter them by taking 2 or 3 provinces, sphere the SGF, retake Alcase, and try to figure a way to sphere or something prussia. Fire the decision, and become an ugly(er) monster.